Improvement in paper-pulp engines



U NrrEn STATES PATENT, OFFICE.

THOMAS NUGENT, OF WHIPPANY, NEW JERSEY, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO DANIEL (JOGHLAN, OF SAME PLACE.

IMPROVEMENT IN PAPER-PULP ENGIN ES.

Specification forming part of Letters Patent No. 130,067, dated July 30, 1872.

Specification describing certain Improvements in Paper -Pulp Engines, invented by THOMAS NUGENT, residing at Whippany, in the county of Morris and State of New Jersey.

This invention relates to the bed-plate of paper-pulp engines; and my improvement consists, first, in gradually increasing the number of knives in the bed-plate from the end adjacent to the mid-fellow to the end abutting against the outer wall or rim of the tub, so as to obtain a gradually-increasing 'cutting-surface from the inner to the outer end of the bedplate, to compensate in the difference in the number of times the stock in diflerent parts of the tub passes over the bed-plate in a given time, the object being to produce pulp of uniform quality throughout the tub; second, in

the employment of angular knives, the angle of which, or the line toward which they converge, is located nearest the outer wall of the tub, so that the increased velocity given to the stock by drawing it rapidly toward this line shall be made available in increasing the speed of the stock traveling near the wall or rim of the tub.

The annexed drawing represents a plan view of the tub of a paper-pulp engine containing my improved bed-plate.

The tub A is made of the ordinary form,

partly divided longitudinally by the mid-felinner end that it is at the outer end, so that the I number of them must gradually be increased from the narrower to the wider end of the bedplate in order to cover it. The knives employed may be straight from one end to the other of the bed-plate; but I prefer to use knives arranged as shown in the drawing. Two series of straight knives may be employed to obtain this arrangement; or angular knives may be used. In either case the line d, toward which the knives converge, is to be located nearest the wider or outer end of the bed-plate, for the purpose already stated, its distance from such end being about one-third of the entire length of the plate.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. A bed-plate, O, for paperpulp engines, having an increasing number of knives from the end next to the mid-fellow to the end next to the rim of the tub, substantially as and for the purpose specified.

2. A bed-plate for paper-pulp engines with angular or elbowing knives converging toward a line, d, nearest its outer end, substantially WM. 0. ADAMSON, WILLIAM MAKER. 

